微米级管状氧化镁团簇体的合成及其吸附磷的性能

doi:10.19964/j.issn.1006-4990.2021-0760

Abstract

Abstract:

Micron?tubular?basic magnesium carbonate clusters（MTBMg） was synthesized by self?assembly technology，and micron?tubular?magnesium oxide clusters（MTMgO） was obtained by further pyrolysis.The composition and morphology of MTMgO were characterized by X-ray diffraction（XRD），scanning electron microscopy（SEM） and BET analysis.The results showed that the MTBMg was synthesized at hydrolysis temperature of 80 ℃ and reaction concentration of 0.6 mol/L，the MTMgO retained the similar structure of precursors and had abundant micro?sized MgO particles，which provided active sites for phosphate adsorption.The adsorption results of phosphorus simulated wastewater showed that the MTMgO exhibited excellent phosphate adsorption performance at wastewater pH of 3~11 and the isothermal adsorption was fitted with the Langmuir model.The maximum adsorption capacity of MTMgO was 2 120.12 mg/g at pH of 10.The kinetic results showed that the phosphate adsorption by MTMgO fitted both pseudo first order kinetics primary and pseudo second order kinetics models，indicating that the adsorption of phosphate could be described by both chemisorption and physical adsorption mechanism.With the increase dosage of MTMgO，the adsorption process shifted from chemisorption?dominated to physisorption?dominated.When the mass concentration of phosphorus in wastewater was 800 mg/L，the phosphate removal rate by adsorbent was 96.47%.

Key words: MgO, basic magnesium carbonate, phosphate, isothermal adsorption, self-assembly

CLC Number:

LIANG Hai,YUAN Tianlong,WANG Wanting,YANG Yunhong,LIANG Wenjie,WANG Xiaomin,DENG Xinzhong. Synthesis of micron?tubular?magnesium oxide clusters and its adsorption performance for phosphate[J]. Inorganic Chemicals Industry, 2022, 54(9): 77-84.

Figures/Tables 13

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References 26

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c（Mg²⁺）/ （mol·L^-1）	Langmuir模型			Freundlich模型
c（Mg²⁺）/ （mol·L^-1）	q/ （mg·g^-1）	K_L/ （L·mg^-1）	R²	n	K_F/ （mg^1-ⁿ ·L ⁿ ·g^-1）	R²
0.4	1 441.83	0.15	0.97	4.15	408.80	0.91
0.5	1 616.10	0.17	0.96	4.30	506.00	0.86
0.6	1 810.85	0.14	0.96	5.10	649.00	0.81
0.7	1 539.83	0.21	0.97	3.96	489.95	0.90
0.8	1 303.28	0.26	0.95	5.34	481.90	0.85

水解温度/℃	Langmuir模型			Freundlich模型
水解温度/℃	q/ （mg·g^-1）	K_L/ （L·mg^-1）	R²	n	K_F/ （mg^1-ⁿ ·L ⁿ ·g^-1）	R²
50	1 503.6	0.12	0.96	3.62	393.03	0.86
60	1 609.9	0.10	0.99	3.30	367.16	0.92
70	1 661.4	0.10	0.99	5.97	678.40	0.86
80	1 810.8	0.14	0.97	5.12	649.02	0.81
90	1 656.3	0.10	0.96	3.51	408.95	0.85

pH	Langmuir模型			Freundlich模型
pH	q/ （mg·g^-1）	K_L/ （L·mg^-1）	R²	K_F/ （mg^1-ⁿ ·L ⁿ ·g^-1）	n	R²
3	1 615.52	0.19	0.94	474.76	3.93	0.86
5	1 810.85	0.14	0.96	649.02	5.12	0.81
7	1 922.37	0.08	0.98	396.91	3.22	0.93
9	2 034.37	0.07	0.99	363.07	3.08	0.96
10	2 120.12	0.11	0.95	539.95	3.96	0.85
11	1 975.92	0.10	0.97	463.01	3.56	0.92

吸附剂加入量/（g·L^-1）	准一级方程			准二级方程
吸附剂加入量/（g·L^-1）	q/ （mg·g^-1）	K₁/ min^-1	R²	q/ （mg·g^-1）	K₂/ （g·mg^-1·min^-1）	R²
0.25	1 541.90	0.035	0.981	1 735.56	2.77×10^-6	0.982
1.00	375.15	0.050	0.978	425.10	1.56×10^-4	0.993
2.00	193.28	0.100	0.996	214.99	6.21×10^-4	0.980

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Inorganic Acid-Base-Salt Committee of CIESC

Synthesis of micron?tubular?magnesium oxide clusters and its adsorption performance for phosphate

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